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(1/2)*(4*x+8) = 1.3-x-2 // - 1.3-x-2
(1/2)*(4*x+8)+x-1.3+2 = 0
1/2*(4*x+8)+x-1.3+2 = 0
1/2*(4*x+8)+x-1.3+2 = 0
3*x-1.3+2+4 = 0
3*x+2+2.7 = 0
3*x+4.7 = 0
3*x+4.7 = 0
3*x+4.7 = 0 // - 4.7
3*x = -4.7 // : 3
x = -4.7/3
x = -1.56666667
x = -1.56666667
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